LOL this is cute naruto gets more free power ups than any damn body sasuke trains to get his things and then practice it in a full blow battle that takes skill. Naruto and sasuke practice chidori and rasenghan then sasuke and naruto trained for variations. Sasuke Fought his brother to get MS and then Implanted his brother eyes which still counts as getting it from that fight cause he didnt hand sasuke those eyes. Naruto trainef for sage mode and bijuu mode came from a bunch of jinchirikis saying we will tell you our names. and then he got that power up. The speed Power up came from then air. Sasuke has not obtained anymore power ups
Naruto got BM by befriending Kurama (finally). And that was AFTER fighting Kurama for the chakra for KM!
We don't know what the result of the "names" powerup is yet.
Well We know susano'o vcan handle a amaeratsu on its body so wouldnt be that bad lmao
LOL!!! True, true, but it would look pretty stupid on Sasuke's part xd
Also if Susanoo and BM work the same way (constant chakra replinishment - that is, any breaches/breaks/whatever are healed), then BM would withstand Amaterasu the same way Susanoo does.
But again - we don't know that. Just an idea.